FCGR2B and chronic myelogenous leukemia, BCR-ABL1 positive: Concordantly, expression of the IL-4 receptor alpha chain was significantly upregulated (2.23-fold, p = 0.0062, data not shown) in CML vs. normal LSK cells in our microarray analysis of the transgenic SCLtTA/Bcr-Abl mouse model [26], which likewise showed FcγRIIb upregulation.